package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;


import java.util.Collections;
import java.util.concurrent.TimeUnit;

/**
 * @program: hmdp
 * @ClassName SimpleRedisLock
 * @description:
 * @author: oldTea
 * @create: 2024-08-13 21:09
 * @Version 1.0
 **/
public class SimpleRedisLock implements ILock{

    private StringRedisTemplate stringRedisTemplate;

    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true) + "-";

    private String name;

    private static  final DefaultRedisScript<Long> UNLOCK_SCRIPT;

    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    public SimpleRedisLock(StringRedisTemplate stringRedisTemplate, String key) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = key;
    }

    @Override
    public boolean tryLock(long timeOutSec) {
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean b = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, threadId + "", timeOutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(b);
    }

//    @Override
//    public void unLock() {
//        //获取当前线程标识
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        //获取redis锁的标识
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if (threadId.equals(id)) {
//            stringRedisTemplate.delete(KEY_PREFIX + name);
//        }
//
//    }
@Override
public void unLock() {
    //获取当前线程标识
    stringRedisTemplate.execute(
            UNLOCK_SCRIPT,
            Collections.singletonList(KEY_PREFIX + name),
            ID_PREFIX + Thread.currentThread().getId());

}
}